iPhone bug: not updating last played or playlist count for podcasts

When you listen to a podcast on an iPhone (OS 3.1) the Play Count and Last Played values are not being updated.

I think these fields are being updated for non-podcast material. (Some users report unpredictable updating.)

This bug is messing up my Smart playlists.

Unfortunately it's not new. I can find reports on it in iPhone OS 2.

Update 9/11/2010: The bug persists into iOS 4.1 and iTunes 10.